From: Mark Brown <broonie@kernel.org>
To: "Franklin S Cooper Jr." <fcooper@ti.com>
Cc: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
nsekhar@ti.com, ssantosh@kernel.org, iivanov@mm-sol.com,
m-karicheri2@ti.com, iivanov.xz@gmail.com,
andy.shevchenko@gmail.com, jarkko.nikula@linux.intel.com,
hkallweit1@gmail.com
Subject: Re: [PATCH] spi: Setup the master controller driver before setting the chipselect
Date: Fri, 16 Oct 2015 15:43:05 +0100 [thread overview]
Message-ID: <20151016144305.GO14956@sirena.org.uk> (raw)
In-Reply-To: <56210966.3040501@ti.com>
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On Fri, Oct 16, 2015 at 09:27:50AM -0500, Franklin S Cooper Jr. wrote:
> Makes sense. How about something like this?
> SPI controllers may need to be properly setup before chip selects
> can be used. Therefore, wait until the spi controller has a chance
> to perform their setup procedure before trying to use the chip
> select.
Yes, that's a lot better - there's also the fact that if we assert chip
select before we've got the pins in a good state we may cause the device
to see signals that confuse it as we change.
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next prev parent reply other threads:[~2015-10-16 14:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-15 20:51 Franklin S Cooper Jr
2015-10-16 10:28 ` Mark Brown
2015-10-16 14:27 ` Franklin S Cooper Jr.
2015-10-16 14:43 ` Mark Brown [this message]
2015-10-16 14:45 ` Franklin S Cooper Jr.
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